gonzostar Posted July 9, 2018 Share Posted July 9, 2018 This is my first photo taken with a 70d. Very happy with it at moment compared to the 450d. However the trifid is skirting through roofs and tv ariels! So some issues with guiding Telescope - 102mm APO ES refractor on a AVX mount Camera- Canon 70d unmoded iso800 with a IDAS-D2 filter. Heavily cropped Duration 100minutes taken over a couple of nights - 300s lights., Darks, flats and bias frames also taken Guided with PHD2 and processed in PS Of course improvement advice much appreciated Thanks for looking Dean Link to comment Share on other sites More sharing options...
wimvb Posted July 9, 2018 Share Posted July 9, 2018 Lovely. How is that IDAS filter working for you? Seems ok. Link to comment Share on other sites More sharing options...
gonzostar Posted July 9, 2018 Author Share Posted July 9, 2018 Thanks Wim Yes it seems to be doing a good job, so long as its not pointing to close to the annoying light source. As you pointed out in a previous post lots, lots more data Do you think this filter will pick up Ha? With a unmodded camera? Cheers Dean Link to comment Share on other sites More sharing options...
Hallingskies Posted July 9, 2018 Share Posted July 9, 2018 An excellent image. I’m amazed you managed to get such a good result on an object so low on the horizon. The Trifid is permanently murked out from where I am, filters or otherwise! Link to comment Share on other sites More sharing options...
gonzostar Posted July 9, 2018 Author Share Posted July 9, 2018 Thanks Hallinskies Luckily i am about half a mile from the seafront. Because of buildings and lights i am limited to half hour with Trifid. So careful planning needed There ls LP between the sea and the house, so do need the filter According to Bortle scale my skies are level 5 Link to comment Share on other sites More sharing options...
Hallingskies Posted July 9, 2018 Share Posted July 9, 2018 3 minutes ago, gonzostar said: According to Bortle scale my skies are level 5 Thought you must be near the sea! Never too sure about Bortle and his scales - they would have to include negative numbers to encompass my southern horizon?... Link to comment Share on other sites More sharing options...
gonzostar Posted July 9, 2018 Author Share Posted July 9, 2018 ? Not sure about bortle either Suppose it all depends on local area Link to comment Share on other sites More sharing options...
wimvb Posted July 9, 2018 Share Posted July 9, 2018 2 hours ago, gonzostar said: Do you think this filter will pick up Ha? Hopefully not! (A good filter should let Ha pass through). And this one is designed to let Ha and Oiii pass through. Generally, all LP filters let Ha, Sii, Oiii, etc pass through, but block sources of light pollution: Na and Hg. How well they block LED light is very much dependent on filter (the new IDAS is designed for this) and LED characteristics. 2 hours ago, gonzostar said: With a unmodded camera? That depends entirely on the camera. Some Canons are good at picking up Ha (60D, I believe), some are not so good. It depends both on the sensor and the filter the filter they put in front of it. Modding involves removing the filter, but can't improve the sensor. Link to comment Share on other sites More sharing options...
gonzostar Posted July 10, 2018 Author Share Posted July 10, 2018 Thanks Wim a clear explanation as usual Link to comment Share on other sites More sharing options...
gorann Posted July 11, 2018 Share Posted July 11, 2018 I have tried Ha imaging with a Canon 60D, which is quite similar to the 70D, and it definitively picks up some Ha. Here is an example where I used a 12nm Ha clip filter (Astronomik) and a Canon 300mm f/4 lens. 6 x 25 min exposure: Link to comment Share on other sites More sharing options...
wimvb Posted July 11, 2018 Share Posted July 11, 2018 36 minutes ago, gorann said: a Canon 60D, which is quite similar to the 70D, and it definitively picks up some Ha. It would be interesting to see a comparison of the two cameras for Ha, since, on paper, there can be a substantial difference between models of the same brand. Link to comment Share on other sites More sharing options...
gorann Posted July 11, 2018 Share Posted July 11, 2018 Yes, the 70D and 60D have different CMOS chips so there is possibly a difference, although I doubt it is significant and the filters in front of the chips may be the same. Maybe there is some info on this page: https://www.cloudynights.com/topic/577770-which-dslrs-have-the-most-ha-response-un-modded/ The cheapest option is probably to buy an Astronomik clip filter. I bought both a 12 nm and 6 nm one and my recommendation is to go for the cheaper 12 nm filter as so little light goes through the 6nm filter that it is almost impossible to focus the scope (at least using live view). The 12 nm filter is 199 Euro, see: https://www.astronomik.com/en/clip-filter/clip-filter-canon-aps-c.html Link to comment Share on other sites More sharing options...
gonzostar Posted July 11, 2018 Author Share Posted July 11, 2018 Okay, I will it it ago on object with Ha Just for a play around i captured some images around Sadr. Hopefully this may show something? Obviously my processing skills are not on the same level as you both. Cheers Dean Link to comment Share on other sites More sharing options...
gonzostar Posted July 12, 2018 Author Share Posted July 12, 2018 Well this is a quick processing effort 2 hours worth of 5 min subs around Sadr area to see if i could collect Ha with the 70d unmodded camera I have also included the tiff file if you want to have ago Autosave001.tif thankyou Dean Link to comment Share on other sites More sharing options...
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